Is it normal to have 2 water temp. senders per motor? One is on the intake manifold and the other is on the block. They are spliced together before they go to the gauge.

You should have one engine temp sensor and one engine temp switch, the same goes for oil pressure. The switches are for the warning alarm. The oil pressure and water temp switch wires should be splices since they go to the same alarm. The sensor wires for the oil pressure and engine temp should be run to their corrosponding guages with nothing spliced into them. It sounds like you may be looking at the switches for the warning sytem and not the sensors for the guages.

The common wire for the alarm ckt is tan with blue tracer

not usually, unless you have 2 temp guages. THEY SHOULD NEVER BE SPLICED TOGETHER. THE ONLY CICUIT(S) TO BE SPLIT IS THE IGNITION , GROUND, OR ALARM. the alrm cicuit has three function's.hi temp, low drive oil. low oil pressure. and this wire goes to the warning buzzer under the dash.

good luck

You may have an older harness like mine with just two alarm switches which are on the common wire tan with blue trace as mentioned above. The later harnesses incorperate a bit more!

Phil

Thank you, your input has saved me a lot of time and money.